script.js

function exportTableToExcel(tableID, filename = "") {
  var downloadLink;
  var dataType = "application/vnd.ms-excel";
  var tableSelect = document.getElementById(tableID);
  var tableHTML = tableSelect.outerHTML.replace(/ /g, "%20");

  // Specify file name
  filename = filename ? filename + ".xls" : "excel_data.xls";

  // Create download link element
  downloadLink = document.createElement("a");

  document.body.appendChild(downloadLink);

  if (navigator.msSaveOrOpenBlob) {
    var blob = new Blob(["\ufeff", tableHTML], {
      type: dataType
    });
    navigator.msSaveOrOpenBlob(blob, filename);
  } else {
    // Create a link to the file
    downloadLink.href = "data:" + dataType + ", " + tableHTML;

    // Setting the file name
    downloadLink.download = filename;

    //triggering the function
    downloadLink.click();
  }
}